All the ________ are made of ________ , not plastics, and this pair of glasses ________ fit for me.
A.glasses; glass; areB.glasses; glass; isC.glass; glasses; areD.glass; glass; is在线课程B
解题思路：glass(玻璃)是物质名词，glasses(眼镜)只有复数形式，这样的构成方法有：
1)由两个相同部分组成的名词，如：trousers裤子，gloves手套，shoes鞋子，scissors剪刀，socks袜子，handcuffs手铐，pincers钳子，jeans牛仔裤，tweezers镊子．
2)以-ing结尾的名词，如：earnings薪水，savings储蓄，findings调查结果，logings住处，sightings发现，winnings奖金，surrounudings环境，greetings致敬．
3)有些名词的用法则习惯上用复数，如：armed to the teeth(武装到牙齿)，shake hands with (握手)，make friends with，by leaps and bounds(突飞猛进)．
以上四例与逻辑有关：很难想象只有一个牙齿，而握手和交朋友都是双方的事，蹦跳起来也不可能只有一步．
下面几例则与婚丧喜庆有关：
My hearty congratulations！(衷心祝贺)
My best regards to her！(问好，致意)
Many happy returns of the day！(祝贺生日用语)
To express one's condolences to(吊唁)